In its third season, when the show moved from CBS to first-run syndication, the new production company wanted the premise inserted into the opening titles, so first-time viewers wouldn't wonder what a Canadian Mountie was doing in Chicago. Paul Gross opted to include the premise in each episode, with "I first came to Chicago on the trail of the killers of my father, and for reasons that don't need exploring at this juncture, I've remained, attached as liaison with the Canadian Consulate." It became a running gag throughout the third season, as the writers found different ways to insert the line into almost each script, whether it was spoken by Fraser or other characters.
Constable Fraser sustained various injuries during the series, but only when he was not wearing his hat, either by choice, or having it knocked off of his head. The hat became known as "The Stetson of Invulnerability."
Leslie Nielsen's recurring character, legendary mountie Buck Frobisher, was named for sixteenth century explorer Sir Martin Frobisher, who explored what is now the Canadian Arctic searching for the Northwest Passage. Iqaluit, capital of Nunavut, was called Frobisher Bay until 1999.
For a while, this was the most popular Canadian-based and produced television series ever shown on a U.S. network. After a break in production following the first two seasons, the producers found international funding to continue production.
In the episode "Mountie Sings the Blues" from the fourth season, officers Huey and Dewey try to write a country and western song. The lyrics that they are working with ("Don't call me for supper, if you don't mean to feed me. Don't tell me you love me with that gun in your hand.") are from the title track of Paul Gross and David Keeley's first CD, named "Two Houses".
David Marciano opted not to return to the series after a contract dispute with Alliance Atlantis, the production company. His character, Ray, was replaced by Callum Keith Rennie. The writers wrote Rennie into the story by saying the original Ray Vecchio had gone deep undercover with the mob.
Fraser is named after the Fraser River in British Columbia. Diefenbaker is named after John Diefenbaker, Prime Minister of Canada, 1957-1963. Thatcher is named after Margaret Thatcher, Prime Minister of the UK, 1979-1990.
The series finale, "Call of the Wild", involved a scene in which twenty Mounties parachuted from a Hercules aircraft. Two parachutists momentarily became entangled in midair, but managed to untangle themselves and landed safely. This segment was shot over the Spray Lakes in Kananaskis, Alberta. The Canadian Forces Skyhawks from CFB Trenton, Ontario were hired to perform the stunts.
Ramona Milano's (Francesca's) real pregnancy, which was hidden in several episodes by strategically placed file folders and furniture, can be seen in the episodes in season four, and then going to the end of the series.
Ray's (David Marciano's) car throughout the first two seasons (apart from the pilot) is a green 1971 Buick Riviera. It has also mistakenly been referred to as a 1972 Riviera (as some of the backup vehicles were that model) in a couple of episodes.
The first season episode "Victoria's Secret" was originally the season finale for that season, and the series finale, but when it was announced the series would be renewed, "Letting Go" was created to answer the questions of what happened after "VS".
Print journalist MacKenzie King, played by two different actresses in two different episodes was named for William Lyon MacKenzie King, who was the longest serving Canadian Prime Minister, from 1921-30, then from 1935 to 1948.